package/rpi-firmware: bump version to 01ecfd2

package/rpi-firmware: bump version to 01ecfd2

Keep rpi-firmware up-to-date with the kernel
vesion bump (4.19.97).

Go back to sha1 version scheme instead of official tag (after
only two tag versions) to keep up with the up-to-date kernel
version (as the offical last tag is for 4.19.94).

Update boot/LICENCE.broadcom hash according to the
'Update to support customisation program ' change ([1]).

[1] https://github.com/raspberrypi/firmware/commit/dd9e9ebb5d5306e91acb135db890cf18f3a5eea2#diff-b7cccbd9821a372750de822dfd97a843

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>